using the mercury mantra for 90 days, would i have photographic memory? or would i need to include a memory exercise along with the magic?

You can vibrate Kenaz + Ansuz 66 times in your 6th chakra. (Kenaz is a Torch in this case which highlights memory and makes it vivid)
Then 3x: vibrate Satanas, "I have a photographic memory", vibrate AUM in your 6th chakra
Close with : Hail Satan!

Use visualization exercises from this manual, as it's really related to "photographic memory".

https://web.archive.org/web/20160214142145/http://spiritualwarfare666.webs.com/Hells_Army_Manual.htm


For those who need to improve visualization just replace affirmation with "I have perfect /vivid visualization"

By practicing. Practice seeing things in your mind. Do math problems, and see it in your mind just like you are writing on a paper. Move the numbers around, and don't lose anything. I don't know what a mantra would do if you aren't really practicing doing it.

Moon rules memory, not mercury. So you ought to use the moon mantra if you want to develop your memory.

Exercise will almost certainly be required, unless your level of power is on that of a god to manifest such powerful results. I personally suggest looking up the memory palace technique. It works great for me as far as memorization goes.

In simplest terms, developing good memory revolves around developing the ability to encode your memories into your mind by vivid visualization coupled with the use of your other senses. I suggest taking a look at the below site if you want to learn more.

https://artofmemory.com/start/

Pointed meditation, flame meditation, a lot of meditation and working on the upper chakras. You will eventually have full access to memory to the point of perfect detailing.

Also an opened 3rd eye offers you abilities of this kind.

There is also Eidetic memory. Seems like there is a difference albeit the only reason why I post wikipedia is for the sources not the legitimacy of wikipedia.

https://en.wikipedia.org/wiki/Eidetic_memory